svga: update driver for version 10 GPU interface

This is a squash commit of roughly two years of development work.
Authors include:
  Brian Paul
  Charmaine Lee
  Thomas Hellstrom
  Jakob Bornecrantz
  Sinclair Yeh
  Mingcheng Chen
  Kai Ninomiya
  MengLin Wu

The driver supports OpenGL 3.3.

Signed-off-by: Brian Paul <brianp@vmware.com>

1 files changed, 353 insertions, 66 deletions

diff --git a/src/gallium/drivers/svga/svga_surface.c b/src/gallium/drivers/svga/svga_surface.c
index 85d0154..79981dc 100644
--- a/src/gallium/drivers/svga/svga_surface.c
+++ b/src/gallium/drivers/svga/svga_surface.c
@@ -29,6 +29,7 @@
 #include "pipe/p_defines.h"
 #include "util/u_inlines.h"
 #include "os/os_thread.h"
+#include "util/u_bitmask.h"
 #include "util/u_format.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
@@ -36,19 +37,21 @@
 #include "svga_format.h"
 #include "svga_screen.h"
 #include "svga_context.h"
+#include "svga_sampler_view.h"
 #include "svga_resource_texture.h"
 #include "svga_surface.h"
 #include "svga_debug.h"
 
+static void svga_mark_surface_dirty(struct pipe_surface *surf);
 
 void
 svga_texture_copy_handle(struct svga_context *svga,
                          struct svga_winsys_surface *src_handle,
                          unsigned src_x, unsigned src_y, unsigned src_z,
-                         unsigned src_level, unsigned src_face,
+                         unsigned src_level, unsigned src_layer,
                          struct svga_winsys_surface *dst_handle,
                          unsigned dst_x, unsigned dst_y, unsigned dst_z,
-                         unsigned dst_level, unsigned dst_face,
+                         unsigned dst_level, unsigned dst_layer,
                          unsigned width, unsigned height, unsigned depth)
 {
    struct svga_surface dst, src;
@@ -59,12 +62,12 @@ svga_texture_copy_handle(struct svga_context *svga,
 
    src.handle = src_handle;
    src.real_level = src_level;
-   src.real_face = src_face;
+   src.real_layer = src_layer;
    src.real_zslice = 0;
 
    dst.handle = dst_handle;
    dst.real_level = dst_level;
-   dst.real_face = dst_face;
+   dst.real_layer = dst_layer;
    dst.real_zslice = 0;
 
    box.x = dst_x;
@@ -103,11 +106,13 @@ svga_texture_copy_handle(struct svga_context *svga,
 struct svga_winsys_surface *
 svga_texture_view_surface(struct svga_context *svga,
                           struct svga_texture *tex,
+                          unsigned bind_flags,
                           SVGA3dSurfaceFlags flags,
                           SVGA3dSurfaceFormat format,
                           unsigned start_mip,
                           unsigned num_mip,
-                          int face_pick,
+                          int layer_pick,
+                          unsigned num_layers,
                           int zslice_pick,
                           struct svga_host_surface_cache_key *key) /* OUT */
 {
@@ -117,8 +122,8 @@ svga_texture_view_surface(struct svga_context *svga,
    unsigned z_offset = 0;
 
    SVGA_DBG(DEBUG_PERF, 
-            "svga: Create surface view: face %d zslice %d mips %d..%d\n",
-            face_pick, zslice_pick, start_mip, start_mip+num_mip-1);
+            "svga: Create surface view: layer %d zslice %d mips %d..%d\n",
+            layer_pick, zslice_pick, start_mip, start_mip+num_mip-1);
 
    key->flags = flags;
    key->format = format;
@@ -127,12 +132,20 @@ svga_texture_view_surface(struct svga_context *svga,
    key->size.height = u_minify(tex->b.b.height0, start_mip);
    key->size.depth = zslice_pick < 0 ? u_minify(tex->b.b.depth0, start_mip) : 1;
    key->cachable = 1;
+   key->arraySize = 1;
+   key->numFaces = 1;
+   key->sampleCount = tex->b.b.nr_samples;
+
+   if (key->sampleCount > 1) {
+      key->flags |= SVGA3D_SURFACE_MASKABLE_ANTIALIAS;
+   }
    
-   if (tex->b.b.target == PIPE_TEXTURE_CUBE && face_pick < 0) {
+   if (tex->b.b.target == PIPE_TEXTURE_CUBE && layer_pick < 0) {
       key->flags |= SVGA3D_SURFACE_CUBEMAP;
       key->numFaces = 6;
-   } else {
-      key->numFaces = 1;
+   } else if (tex->b.b.target == PIPE_TEXTURE_1D_ARRAY ||
+              tex->b.b.target == PIPE_TEXTURE_2D_ARRAY) {
+      key->arraySize = num_layers;
    }
 
    if (key->format == SVGA3D_FORMAT_INVALID) {
@@ -141,7 +154,7 @@ svga_texture_view_surface(struct svga_context *svga,
    }
 
    SVGA_DBG(DEBUG_DMA, "surface_create for texture view\n");
-   handle = svga_screen_surface_create(ss, key);
+   handle = svga_screen_surface_create(ss, bind_flags, PIPE_USAGE_DEFAULT, key);
    if (!handle) {
       key->cachable = 0;
       return NULL;
@@ -149,15 +162,15 @@ svga_texture_view_surface(struct svga_context *svga,
 
    SVGA_DBG(DEBUG_DMA, " --> got sid %p (texture view)\n", handle);
 
-   if (face_pick < 0)
-      face_pick = 0;
+   if (layer_pick < 0)
+      layer_pick = 0;
 
    if (zslice_pick >= 0)
       z_offset = zslice_pick;
 
    for (i = 0; i < key->numMipLevels; i++) {
-      for (j = 0; j < key->numFaces; j++) {
-         if (svga_is_texture_level_defined(tex, j + face_pick, i + start_mip)) {
+      for (j = 0; j < key->numFaces * key->arraySize; j++) {
+         if (svga_is_texture_level_defined(tex, j + layer_pick, i + start_mip)) {
             unsigned depth = (zslice_pick < 0 ?
                               u_minify(tex->b.b.depth0, i + start_mip) :
                               1);
@@ -166,7 +179,7 @@ svga_texture_view_surface(struct svga_context *svga,
                                      tex->handle, 
                                      0, 0, z_offset, 
                                      i + start_mip, 
-                                     j + face_pick,
+                                     j + layer_pick,
                                      handle, 0, 0, 0, i, j,
                                      u_minify(tex->b.b.width0, i + start_mip),
                                      u_minify(tex->b.b.height0, i + start_mip),
@@ -179,33 +192,43 @@ svga_texture_view_surface(struct svga_context *svga,
 }
 
 
+/**
+ * A helper function to create a surface view.
+ * The view boolean flag specifies whether svga_texture_view_surface()
+ * will be called to create a cloned surface and resource for the view.
+ */
 static struct pipe_surface *
-svga_create_surface(struct pipe_context *pipe,
-                    struct pipe_resource *pt,
-                    const struct pipe_surface *surf_tmpl)
+svga_create_surface_view(struct pipe_context *pipe,
+                         struct pipe_resource *pt,
+                         const struct pipe_surface *surf_tmpl,
+                         boolean view)
 {
    struct svga_context *svga = svga_context(pipe);
    struct svga_texture *tex = svga_texture(pt);
    struct pipe_screen *screen = pipe->screen;
    struct svga_screen *ss = svga_screen(screen);
    struct svga_surface *s;
-   unsigned face, zslice;
-   boolean view = FALSE;
-   SVGA3dSurfaceFlags flags;
+   unsigned layer, zslice, bind;
+   unsigned nlayers = 1;
+   SVGA3dSurfaceFlags flags = 0;
    SVGA3dSurfaceFormat format;
 
-   assert(surf_tmpl->u.tex.first_layer == surf_tmpl->u.tex.last_layer);
-
    s = CALLOC_STRUCT(svga_surface);
    if (!s)
       return NULL;
 
    if (pt->target == PIPE_TEXTURE_CUBE) {
-      face = surf_tmpl->u.tex.first_layer;
+      layer = surf_tmpl->u.tex.first_layer;
       zslice = 0;
    }
+   else if (pt->target == PIPE_TEXTURE_1D_ARRAY ||
+            pt->target == PIPE_TEXTURE_2D_ARRAY) {
+      layer = surf_tmpl->u.tex.first_layer;
+      zslice = 0;
+      nlayers = surf_tmpl->u.tex.last_layer - surf_tmpl->u.tex.first_layer + 1;
+   }
    else {
-      face = 0;
+      layer = 0;
       zslice = surf_tmpl->u.tex.first_layer;
    }
 
@@ -218,25 +241,93 @@ svga_create_surface(struct pipe_context *pipe,
    s->base.u.tex.level = surf_tmpl->u.tex.level;
    s->base.u.tex.first_layer = surf_tmpl->u.tex.first_layer;
    s->base.u.tex.last_layer = surf_tmpl->u.tex.last_layer;
+   s->view_id = SVGA3D_INVALID_ID;
+
+   s->backed = NULL;
 
    if (util_format_is_depth_or_stencil(surf_tmpl->format)) {
-      flags = SVGA3D_SURFACE_HINT_DEPTHSTENCIL;
+      flags = SVGA3D_SURFACE_HINT_DEPTHSTENCIL |
+              SVGA3D_SURFACE_BIND_DEPTH_STENCIL;
+      bind = PIPE_BIND_DEPTH_STENCIL;
    }
    else {
-      flags = SVGA3D_SURFACE_HINT_RENDERTARGET;
+      flags = SVGA3D_SURFACE_HINT_RENDERTARGET |
+              SVGA3D_SURFACE_BIND_RENDER_TARGET;
+      bind = PIPE_BIND_RENDER_TARGET;
    }
 
-   format = svga_translate_format(ss, surf_tmpl->format, 0);
+   if (tex->imported)
+      format = tex->key.format;
+   else
+      format = svga_translate_format(ss, surf_tmpl->format, bind);
+
    assert(format != SVGA3D_FORMAT_INVALID);
 
-   if (svga_screen(screen)->debug.force_surface_view)
-      view = TRUE;
+   if (view) {
+      SVGA_DBG(DEBUG_VIEWS, "svga: Surface view: yes %p, level %u layer %u z %u, %p\n",
+               pt, surf_tmpl->u.tex.level, layer, zslice, s);
+
+      if (svga_have_vgpu10(svga)) {
+         switch (pt->target) {
+         case PIPE_TEXTURE_1D:
+            flags |= SVGA3D_SURFACE_1D;
+            break;
+         case PIPE_TEXTURE_1D_ARRAY:
+            flags |= SVGA3D_SURFACE_1D | SVGA3D_SURFACE_ARRAY;
+            break;
+         case PIPE_TEXTURE_2D_ARRAY:
+            flags |= SVGA3D_SURFACE_ARRAY;
+            break;
+         case PIPE_TEXTURE_3D:
+            flags |= SVGA3D_SURFACE_VOLUME;
+            break;
+         case PIPE_TEXTURE_CUBE:
+            if (nlayers == 6)
+               flags |= SVGA3D_SURFACE_CUBEMAP;
+            break;
+         default:
+            break;
+         }
+      }
 
-   /* Currently only used for compressed textures */
-   if (format != svga_translate_format(ss, surf_tmpl->format, 0)) {
-      view = TRUE;
+      /* When we clone the surface view resource, use the format used in
+       * the creation of the original resource.
+       */
+      s->handle = svga_texture_view_surface(svga, tex, bind, flags, tex->key.format,
+                                            surf_tmpl->u.tex.level, 1,
+                                            layer, nlayers, zslice, &s->key);
+      s->key.format = format;
+      s->real_layer = 0;
+      s->real_level = 0;
+      s->real_zslice = 0;
+   } else {
+      SVGA_DBG(DEBUG_VIEWS, "svga: Surface view: no %p, level %u, layer %u, z %u, %p\n",
+               pt, surf_tmpl->u.tex.level, layer, zslice, s);
+
+      memset(&s->key, 0, sizeof s->key);
+      s->key.format = format;
+      s->handle = tex->handle;
+      s->real_layer = layer;
+      s->real_zslice = zslice;
+      s->real_level = surf_tmpl->u.tex.level;
    }
 
+   return &s->base;
+}
+
+
+static struct pipe_surface *
+svga_create_surface(struct pipe_context *pipe,
+                    struct pipe_resource *pt,
+                    const struct pipe_surface *surf_tmpl)
+{
+   struct svga_context *svga = svga_context(pipe);
+   struct pipe_screen *screen = pipe->screen;
+   boolean view = FALSE;
+
+   if (svga_screen(screen)->debug.force_surface_view)
+      view = TRUE;
+
    if (surf_tmpl->u.tex.level != 0 &&
        svga_screen(screen)->debug.force_level_surface_view)
       view = TRUE;
@@ -244,47 +335,170 @@ svga_create_surface(struct pipe_context *pipe,
    if (pt->target == PIPE_TEXTURE_3D)
       view = TRUE;
 
-   if (svga_screen(screen)->debug.no_surface_view)
+   if (svga_have_vgpu10(svga) || svga_screen(screen)->debug.no_surface_view)
       view = FALSE;
 
-   if (view) {
-      SVGA_DBG(DEBUG_VIEWS, "svga: Surface view: yes %p, level %u face %u z %u, %p\n",
-               pt, surf_tmpl->u.tex.level, face, zslice, s);
+   return svga_create_surface_view(pipe, pt, surf_tmpl, view);
+}
 
-      s->handle = svga_texture_view_surface(svga, tex, flags, format,
-                                            surf_tmpl->u.tex.level,
-                                            1, face, zslice, &s->key);
-      s->real_face = 0;
-      s->real_level = 0;
-      s->real_zslice = 0;
-   } else {
-      SVGA_DBG(DEBUG_VIEWS, "svga: Surface view: no %p, level %u, face %u, z %u, %p\n",
-               pt, surf_tmpl->u.tex.level, face, zslice, s);
 
-      memset(&s->key, 0, sizeof s->key);
-      s->handle = tex->handle;
-      s->real_face = face;
-      s->real_zslice = zslice;
-      s->real_level = surf_tmpl->u.tex.level;
+/**
+ * Clone the surface view and its associated resource.
+ */
+static struct svga_surface *
+create_backed_surface_view(struct svga_context *svga, struct svga_surface *s)
+{
+   struct svga_surface *bs = s->backed;
+
+   if (bs == NULL) {
+      struct svga_texture *tex = svga_texture(s->base.texture);
+      struct pipe_surface *backed_view;
+
+      backed_view = svga_create_surface_view(&svga->pipe,
+                                             &tex->b.b,
+                                             &s->base,
+                                             TRUE);
+
+      bs = svga_surface(backed_view);
+      s->backed = bs;
    }
 
+   svga_mark_surface_dirty(&bs->base);
+
+   return bs;
+}
+
+/**
+ * Create a DX RenderTarget/DepthStencil View for the given surface,
+ * if needed.
+ */
+struct pipe_surface *
+svga_validate_surface_view(struct svga_context *svga, struct svga_surface *s)
+{
+   enum pipe_error ret = PIPE_OK;
+   int try;
+
+   assert(svga_have_vgpu10(svga));
+
+   /**
+    * DX spec explicitly specifies that no resource can be bound to a render
+    * target view and a shader resource view simultanously.
+    * So first check if the resource bound to this surface view collides with
+    * a sampler view. If so, then we will clone this surface view and its
+    * associated resource. We will then use the cloned surface view for
+    * render target.
+    */
+   if (svga_check_sampler_view_resource_collision(svga, s->handle)) {
+      SVGA_DBG(DEBUG_VIEWS,
+               "same resource used in shaderResource and renderTarget 0x%x\n",
+               s->handle);
+      s = create_backed_surface_view(svga, s);
+   }
+
+   if (s->view_id == SVGA3D_INVALID_ID) {
+      SVGA3dResourceType resType;
+      SVGA3dRenderTargetViewDesc desc;
+
+      desc.tex.mipSlice = s->real_level;
+      desc.tex.firstArraySlice = s->real_layer + s->real_zslice;
+      desc.tex.arraySize =
+         s->base.u.tex.last_layer - s->base.u.tex.first_layer + 1;
+
+      s->view_id = util_bitmask_add(svga->surface_view_id_bm);
+
+      switch (s->base.texture->target) {
+      case PIPE_TEXTURE_1D:
+      case PIPE_TEXTURE_1D_ARRAY:
+         resType = SVGA3D_RESOURCE_TEXTURE1D;
+         break;
+      case PIPE_TEXTURE_RECT:
+      case PIPE_TEXTURE_2D:
+      case PIPE_TEXTURE_2D_ARRAY:
+      case PIPE_TEXTURE_CUBE:
+         /* drawing to cube map is treated as drawing to 2D array */
+         resType = SVGA3D_RESOURCE_TEXTURE2D;
+         break;
+      case PIPE_TEXTURE_3D:
+         resType = SVGA3D_RESOURCE_TEXTURE3D;
+         break;
+      default:
+         assert(!"Unexpected texture target");
+         resType = SVGA3D_RESOURCE_TEXTURE2D;
+      }
+
+      for (try = 0; try < 2; try++) {
+         if (util_format_is_depth_or_stencil(s->base.format)) {
+            ret = SVGA3D_vgpu10_DefineDepthStencilView(svga->swc,
+                                                       s->view_id,
+                                                       s->handle,
+                                                       s->key.format,
+                                                       resType,
+                                                       &desc);
+         }
+         else {
+            ret = SVGA3D_vgpu10_DefineRenderTargetView(svga->swc,
+                                                       s->view_id,
+                                                       s->handle,
+                                                       s->key.format,
+                                                       resType,
+                                                       &desc);
+         }
+         if (ret == PIPE_OK)
+            break;
+         svga_context_flush(svga, NULL);
+      }
+
+      assert(ret == PIPE_OK);
+      if (ret != PIPE_OK) {
+         util_bitmask_clear(svga->surface_view_id_bm, s->view_id);
+         s->view_id = SVGA3D_INVALID_ID;
+      }
+   }
    return &s->base;
 }
 
 
+
 static void
 svga_surface_destroy(struct pipe_context *pipe,
                      struct pipe_surface *surf)
 {
+   struct svga_context *svga = svga_context(pipe);
    struct svga_surface *s = svga_surface(surf);
    struct svga_texture *t = svga_texture(surf->texture);
    struct svga_screen *ss = svga_screen(surf->texture->screen);
+   enum pipe_error ret = PIPE_OK;
+
+   /* Destroy the backed view surface if it exists */
+   if (s->backed) {
+      svga_surface_destroy(pipe, &s->backed->base);
+      s->backed = NULL;
+   }
 
    if (s->handle != t->handle) {
       SVGA_DBG(DEBUG_DMA, "unref sid %p (tex surface)\n", s->handle);
       svga_screen_surface_destroy(ss, &s->key, &s->handle);
    }
 
+   if (s->view_id != SVGA3D_INVALID_ID) {
+      unsigned try;
+
+      assert(svga_have_vgpu10(svga));
+      for (try = 0; try < 2; try++) {
+         if (util_format_is_depth_or_stencil(s->base.format)) {
+            ret = SVGA3D_vgpu10_DestroyDepthStencilView(svga->swc, s->view_id);
+         }
+         else {
+            ret = SVGA3D_vgpu10_DestroyRenderTargetView(svga->swc, s->view_id);
+         }
+         if (ret == PIPE_OK)
+            break;
+         svga_context_flush(svga, NULL);
+      }
+      assert(ret == PIPE_OK);
+      util_bitmask_clear(svga->surface_view_id_bm, s->view_id);
+   }
+
    pipe_resource_reference(&surf->texture, NULL);
    FREE(surf);
 }
@@ -302,11 +516,8 @@ svga_mark_surface_dirty(struct pipe_surface *surf)
 
       if (s->handle == tex->handle) {
          /* hmm so 3d textures always have all their slices marked ? */
-         if (surf->texture->target == PIPE_TEXTURE_CUBE)
-            svga_define_texture_level(tex, surf->u.tex.first_layer,
-                                      surf->u.tex.level);
-         else
-            svga_define_texture_level(tex, 0, surf->u.tex.level);
+         svga_define_texture_level(tex, surf->u.tex.first_layer,
+                                   surf->u.tex.level);
       }
       else {
          /* this will happen later in svga_propagate_surface */
@@ -345,18 +556,26 @@ svga_propagate_surface(struct svga_context *svga, struct pipe_surface *surf)
    struct svga_surface *s = svga_surface(surf);
    struct svga_texture *tex = svga_texture(surf->texture);
    struct svga_screen *ss = svga_screen(surf->texture->screen);
-   unsigned zslice, face;
+   unsigned zslice, layer;
+   unsigned nlayers = 1;
+   unsigned i;
 
    if (!s->dirty)
       return;
 
    if (surf->texture->target == PIPE_TEXTURE_CUBE) {
       zslice = 0;
-      face = surf->u.tex.first_layer;
+      layer = surf->u.tex.first_layer;
+   }
+   else if (surf->texture->target == PIPE_TEXTURE_1D_ARRAY ||
+            surf->texture->target == PIPE_TEXTURE_2D_ARRAY) {
+      zslice = 0;
+      layer = surf->u.tex.first_layer;
+      nlayers = surf->u.tex.last_layer - surf->u.tex.first_layer + 1;
    }
    else {
       zslice = surf->u.tex.first_layer;
-      face = 0;
+      layer = 0;
    }
 
    s->dirty = FALSE;
@@ -367,12 +586,14 @@ svga_propagate_surface(struct svga_context *svga, struct pipe_surface *surf)
       SVGA_DBG(DEBUG_VIEWS,
                "svga: Surface propagate: tex %p, level %u, from %p\n",
                tex, surf->u.tex.level, surf);
-      svga_texture_copy_handle(svga,
-                               s->handle, 0, 0, 0, s->real_level, s->real_face,
-                               tex->handle, 0, 0, zslice, surf->u.tex.level, face,
-                               u_minify(tex->b.b.width0, surf->u.tex.level),
-                               u_minify(tex->b.b.height0, surf->u.tex.level), 1);
-      svga_define_texture_level(tex, face, surf->u.tex.level);
+      for (i = 0; i < nlayers; i++) {
+         svga_texture_copy_handle(svga,
+                                  s->handle, 0, 0, 0, s->real_level, s->real_layer + i,
+                                  tex->handle, 0, 0, zslice, surf->u.tex.level, layer + i,
+                                  u_minify(tex->b.b.width0, surf->u.tex.level),
+                                  u_minify(tex->b.b.height0, surf->u.tex.level), 1);
+         svga_define_texture_level(tex, layer + i, surf->u.tex.level);
+      }
    }
 }
 
@@ -390,10 +611,76 @@ svga_surface_needs_propagation(const struct pipe_surface *surf)
 }
 
 
+static void
+svga_get_sample_position(struct pipe_context *context,
+                         unsigned sample_count, unsigned sample_index,
+                         float *pos_out)
+{
+   /* We can't actually query the device to learn the sample positions.
+    * These were grabbed from nvidia's driver.
+    */
+   static const float pos1[1][2] = {
+      { 0.5, 0.5 }
+   };
+   static const float pos4[4][2] = {
+      { 0.375000, 0.125000 },
+      { 0.875000, 0.375000 },
+      { 0.125000, 0.625000 },
+      { 0.625000, 0.875000 }
+   };
+   static const float pos8[8][2] = {
+      { 0.562500, 0.312500 },
+      { 0.437500, 0.687500 },
+      { 0.812500, 0.562500 },
+      { 0.312500, 0.187500 },
+      { 0.187500, 0.812500 },
+      { 0.062500, 0.437500 },
+      { 0.687500, 0.937500 },
+      { 0.937500, 0.062500 }
+   };
+   static const float pos16[16][2] = {
+      { 0.187500, 0.062500 },
+      { 0.437500, 0.187500 },
+      { 0.062500, 0.312500 },
+      { 0.312500, 0.437500 },
+      { 0.687500, 0.062500 },
+      { 0.937500, 0.187500 },
+      { 0.562500, 0.312500 },
+      { 0.812500, 0.437500 },
+      { 0.187500, 0.562500 },
+      { 0.437500, 0.687500 },
+      { 0.062500, 0.812500 },
+      { 0.312500, 0.937500 },
+      { 0.687500, 0.562500 },
+      { 0.937500, 0.687500 },
+      { 0.562500, 0.812500 },
+      { 0.812500, 0.937500 }
+   };
+   const float (*positions)[2];
+
+   switch (sample_count) {
+   case 4:
+      positions = pos4;
+      break;
+   case 8:
+      positions = pos8;
+      break;
+   case 16:
+      positions = pos16;
+      break;
+   default:
+      positions = pos1;
+   }
+
+   pos_out[0] = positions[sample_index][0];
+   pos_out[1] = positions[sample_index][1];
+}
+
 
 void
 svga_init_surface_functions(struct svga_context *svga)
 {
    svga->pipe.create_surface = svga_create_surface;
    svga->pipe.surface_destroy = svga_surface_destroy;
+   svga->pipe.get_sample_position = svga_get_sample_position;
 }